Hydraulic lifting device.



C. E. P. IULIEN & R. MARGUERAT.

HYnRAuuc LIFHNG DEVICE.

APPLICATION FILED APR25| |918.

Patented July 23,1918.

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HYDRAULIC LIFTING DEVICE.

APrLlcATloN FILED APR.25. |918.

Patented July 23, 1918.

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HYDRAULIC L|FT|NG DEVICE.

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Wfl/Ilm A T'ORNEKS APPLICATION FILED APIL25. l9l8.

Patented July 23,1918..

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UmTED STATES PATENT OFFICE.

CYPRIEN' EDOUARD PAUL JULIEN AND ROBERT MARGUERAT, 0F PARIS, FRANCE.

t Specification of Letters Patent.

Application led April 25, 1918. Serial No. 230,853.

To aZZ 'whom z't may concern.'

Be it knownthat we, CYPRIEN EDOUARD PAUL JULIEN', engineer, a citizen of the French Republic, residing in Paris, France, 1 Avenue de lObservatoire, and ROBERT MARGUERAT, engineer, a citizen of the Swiss Republic,residing in Paris, 41 Boulevard Haussmann, have invented certain new and useful Improvements in Hydraulic Lifting Devices, of which the following is a speclication.

This invention has for its object a de vice enabling to handle-a mass and keep it 1n a condition of equilibrium varying in different positions, andis more particularly applicable in connection with cultivatlng mo- In some of the latter use is made: either of rotary organs stirring the ground, or of frames carrying plow-shares-or disks, or of any other working tools or implements for varying purposes, the one and the others being, as a rule, movable in different planes.

It is necessarily useful to give them the facilit of becomin automatically raised or shifte either at t e limit of the land, or when encountering an obstruction, independently from the use of springs, upon the tension of which it is not possible to rely with certainty.

The rotary whole of a digging cutter, for instance must be capable of sinking from its uppermost to its lowermost position in the bottom of the furrow; it must be able, in its uppermost position, to be hung yieldingly; moreover it is necessary that it be always in equilibrium, whatever be the position in which it lies.

This result is obtained by means of a device comprising a piston which works, under the action of a liquid or Huid under pressure, in a capacity in which equally works a smaller piston acted upon by a spring, the tension of which compensates the difference of area of both pistons.

In the accompanying drawings, which illustrate, by way of example, a constructional formof the device applied to the raising of a digging cutter:

Figures 1, 2 and 3 show the various positions of the device during the handling of the same.

Said device comprises a tank a suitably mounted on the automobile tractor provided with its digging cutter Z) arranged at the end of a lever c pivoted at d on the cultivating motor-implement, and connected at e, by a'cable f, with the end of the rod g of a large piston lz. working into a cylinder i in communication with-the interior of the tank a through apertures or ducts j. The cylinder i is integral with a cylinder of. smaller diameter lc, into Whichworks a 'small piston Z. The cylinder k communicates with the interior of the tank through an aperture or duct m. The rod n of the small piston Z is connected with a lever o moving along a notched sector p; the level o, when it moves freely, and consequently the piston Z, are constantly pulled back by a sprin g. The tank a contains a pump for liqui (for instance, oil) r communicating, through the pipe s, with the interior of the cylindrical capacity In, and consequently with z'.

The working of the apparatus is as follows: l t In Fig. 1, the liquid delivered by the pum 1 passes through thel pipe s and forces bac the large piston l1., which uncovers the oriices j. The cutter b is thushung yicldingly, since the orifices y' fulfil the function of hydraulic buffer. In this position, the cutter is in its uppermost position and its stopping is automatical.

In Fig. 2, when the lever o is pushed forward, the small piston Z uncovers the orifice m. The liquid delivered by the pump r, as well as the liquid contained into the large cylinder z', passes through the orifice m, thence returning to the tank a; the large piston h recedes toward the left under the weight of the cutter b, whereby the latter is brought to its lowermost osition.

In Fig. 3, the lever o being freed from the stopping notches, the returning spring g tends always to close again the orifice m by means of the small piston Z it then suffices to adjust the compensating spring g in such a manner that the small iston Z balance the pressure merely arising rom the weight of the mass b. The liquid supplied by the pump will tend to force back the small piston Z and to open the orifice m; the pressure produced in the large cylinder 'will maintain the stability of the cutter in any position intermediate between the uppermost and lowermost positions.

Patented July 23, 1918.

The spring Q may be replaced by any other tensioning or compensating device particularly by a piston. y

What we claim is: Y

1. A device of the character described, comprising two pistons of different areas and operated by fluid pressure, the larger piston being adapted to be connected with the element to be operated, and a tension device for the smaller piston.

A device of the character described, comprising two pistons of different areas, the larger piston being adapted to bc connected with the element to bel operated, means for admitting a fluid between the pistons, and a tension device for the smaller piston.

3. A device of thecharacter described, comprising two cylinders of dilierent diameters and communicating with each other, each cylinder having an opening therein, a piston in each cylinder, means for admitting a fluid between the pistons, the larger piston being adapted to be connected with the element to be operated, and a tension device connected with the smaller piston.

4. A device of the character described, comprising two cylinders of different diameters and communicating with each other, each cylinder having an opening therein, a piston in each cylinder, the piston rod of the larger piston being adapted tobe connected with the element to be raised, means for admitting a fluid between the pistons, and an adjustable spring device connected with the piston rod of the smaller piston.

5. A device of the character described, comprising two cylinders of diii'crent dialneters and communicating with each other, each cylinder having an opening therein, a piston in each cylinder, the piston rod of the larger piston being adapted to be connected with the member to be raised, means for admitting a Huid between the pistons, and a manually operable spring pressed lever with which the piston rod of the smaller piston is connected.

(3. A device of the character described, comprising a liquid tank, two cylinders of different diameters mounted upon the tank, and communicating with each other, each cylinder having an opening leading into the tank, a piston in each cylinder, the piston rod of the larger piston being adapted to be-connected with the member to be raised, a pump for forcing the liquid between the pistons, a manually operable lever to which the piston rod of the Smaller piston is secured, a spring secured to the lever and to a fixed member, and means for adjusting the tension of the spring.

In testimony whereof we have hereunto set our hands at the city of Paris, (France), this 19th day of March, 1918.

CYPRIEN EDOUARD PAUL JULIEN. ROBERT MRGUERAT. In tlve presence of- CHAs. P. PREssLY. 

